CN108398851A - A kind of projection screen automatically controls all-in-one machine - Google Patents
A kind of projection screen automatically controls all-in-one machine Download PDFInfo
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- CN108398851A CN108398851A CN201810381390.XA CN201810381390A CN108398851A CN 108398851 A CN108398851 A CN 108398851A CN 201810381390 A CN201810381390 A CN 201810381390A CN 108398851 A CN108398851 A CN 108398851A
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- projecting apparatus
- projection screen
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- painting canvas
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- 238000010422 painting Methods 0.000 claims abstract description 61
- 238000005034 decoration Methods 0.000 claims abstract description 45
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- 230000007423 decrease Effects 0.000 claims description 7
- 230000000630 rising effect Effects 0.000 claims description 4
- 230000006872 improvement Effects 0.000 description 8
- 230000005611 electricity Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
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- 208000018747 cerebellar ataxia with neuropathy and bilateral vestibular areflexia syndrome Diseases 0.000 description 1
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Projection Apparatus (AREA)
Abstract
A kind of projection screen of present invention offer automatically controls all-in-one machine, including projection screen, decoration painting canvas, four side picture frames and control system, its main feature is that：Frame is four side picture frames, projection screen in four side picture frames including front and back setting and decoration painting canvas, projection screen or/and decoration painting canvas are motor and the roller shutter type that driving mechanism drives, control system includes connection projecting apparatus power supply interface and controller, controller includes curtain switching circuit, and the control terminal of motor is connect with the control output end of curtain switching circuit；When connecting, projecting apparatus power supply interface connect with projecting apparatus and when projecting apparatus booting work, control system, which automatically controls to roll to decorate, painting canvas and to be exposed subsequent projection screen or put down projection screen；When projecting apparatus is shut down, control system, which automatically controls, to be put down decoration painting canvas or rolls projection screen.The degree of automation is improved, use easy to operation improves efficiency.And control system is simple, and it is at low cost, easily realize.
Description
Technical field
The present invention relates to projecting apparatus and curtain technical fields, are widely used in smart home, hotel's multimedia, showground
Equal places, specifically a kind of projection screen automatically control all-in-one machine.
Background technology
Traditional projection device is divided into projecting apparatus and curtain two parts, and when use need to open curtain, and projecting apparatus is placed on
Suitable position, and be adjusted.Conventional projector is projected to from the front remote position of curtain on curtain, explains and publicises people station
The meeting shield portions project content before curtain, and project light and there is influence to the sight for explaining and publicising people.Conventional projector and curtain
There are problems that distribution type, projecting apparatus and the curtain of different manufacturers production have the problems such as not matching.
Chinese patent（The patent No.：201721245430）" a kind of projection curtain device " is disclosed, structure includes handle
Hand, supporting rack, shock-absorbing footing, pull rod, curtain black surround, curtain, outer cover, short focus hanger, projecting apparatus, fixing bolt, turns fixed link
Disk hangs pawl, adjusting rod, pedestal, and the shock-absorbing footing upper end is connect by bolt mode with support frame bottom, the fixation
Bar left and right ends are installed on supporting rack both ends.It is integrated with projecting apparatus that the patent realizes projection arrangement, also substantially solves
Conventional projector and the above problem existing for curtain.But the patent, using the curtain of hand-operated lifting, there is no using electricity
The projection screen and painting canvas of control driving lifting more fail to disclose how to join on curtain or painting canvas lifting and the switch of projecting apparatus
The circuit and structure of dynamic control.
How integral type projection screen and decoration painting canvas and shot-light to be used cooperatively, when opening projecting apparatus in use, can be with
It automatic rolls up decoration painting to expose projection screen or put down projection screen, and closes shot-light；When closing projecting apparatus, dress is put down automatically
Decorations painting canvas rolls projection screen, and opens shot-light, use easy to operation, improves efficiency, this is integral type projection curtain device
Urgent problem to be solved at present.
Invention content
The present invention in view of the above-mentioned problems existing in the prior art, provides a kind of projection screen and automatically controls all-in-one machine, when beating
It opens projecting apparatus and rolls decoration painting canvas in use, can automatically control and expose subsequent projection screen or put down projection screen；When
When closing projecting apparatus, decoration painting canvas being put down automatically or rolls projection screen, improve the degree of automation, use easy to operation improves
Efficiency.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of projection screen automatically controls all-in-one machine, including：Projection screen, decoration painting canvas, frame and control system, feature exist
In the frame is four side picture frames, includes the projection screen and decoration painting canvas of front and back setting, the projection in the picture frame of four side
Curtain or/and decoration painting canvas are motor and the roller shutter type that driving mechanism drives, and the control system includes that connection projecting apparatus supplies
Electrical interface and controller, the controller include curtain switching circuit, the control of the control terminal and curtain switching circuit of the motor
Output end connection processed；When connecting, projecting apparatus power supply interface connect with projecting apparatus and when projecting apparatus booting work, the control is
System, which automatically controls, to be rolled decoration painting canvas and exposes subsequent projection screen or put down projection screen；It is described when projecting apparatus is shut down
Control system, which automatically controls, to be put down decoration painting canvas or rolls projection screen.
Improvement to said program：Shot-light is set on the picture frame of four side, the controller further includes shot-light switching circuit,
The shot-light is connect with the control output end of the shot-light switching circuit, when connection projecting apparatus power supply interface is connect with projecting apparatus
And when projecting apparatus booting work, the control system automatically controls the shot-light and closes, when projecting apparatus shutdown and the decoration painting
When cloth exposes, the control system automatically opens the shot-light.
Further improvement of these options：Cable tube is set on the top margin of four side picture frame or/and bottom edge, described four
Projector mount is set on the top margin of side picture frame or the cable tube of bottom edge connection, projecting apparatus box is set on the projector mount
Body, the projecting apparatus are arranged in the projecting apparatus box body, and the shot-light is arranged in the projecting apparatus box body.
Further improvement of these options：The projection screen is fixed, the projection screen surrounding and described four
Side picture frame is fixedly connected by curtain frame, and the decoration painting canvas is roller shutter type and is arranged before the projection screen, described
Motor is tube shaped electric machine, and the driving mechanism includes that the top of four side picture frame is connect and be horizontally installed on the tube shaped electric machine
Painting canvas spool in side, for the decoration painting cloth on the painting canvas spool, the tube shaped electric machine is solid by motor fixing frame
It is scheduled on one end in the top margin of four side picture frame.
Further improvement of these options：The curtain switching circuit includes intermediate relay J1, intermediate relay
The power supply coil end J1A and power supply coil end J1B of J1 is connected with the connection projecting apparatus with power supply interface, intermediate relay J1
Stationary contact end J1C connect with a power supply end L of the motor；The normally closed movable contact J1E of the intermediate relay J1
It is connect with the decline control terminal DOWN of the motor, the normally opened movable contact J1D of the intermediate relay J1 is upper with the motor
Rise control terminal UP connections；
When connect projecting apparatus power supply interface connect with projecting apparatus and projecting apparatus booting work when, the intermediate relay J1 obtains electric
Action, stationary contact end J1C are connected to normally opened movable contact J1D, and the rising control terminal UP of the motor connects power supply end L,
Motor rises operation, and decoration painting cloth is driven to roll；When projecting apparatus is stopped, the intermediate relay J1 does not work, described
The decline control terminal DOWN of motor connects power supply end L by the normally closed movable contact J1E of relay J1 with stationary contact end J1C,
The motor declines operation, and decoration painting cloth is driven to decline.
Further improvement of these options：The shot-light switching circuit includes intermediate relay J2, intermediate relay
The power supply coil end J2A and power supply coil end J2B of J2 is connected with the connection projecting apparatus with power supply interface, the intermediate relay
The stationary contact end J2C of device J2 is connect with a power supply end L of the shot-light, the normally closed movable contact of the intermediate relay J2
J2E is connect with one end of the shot-light, and the other end of the shot-light is connected to another power supply end N.
Further improvement of these options：A manual switch K is also in series in the current supply circuit of the shot-light.
Further improvement of these options：The controller is arranged in the projecting apparatus box body, the projecting apparatus and
Cable in control system penetrates in the top margin or/and bottom edge of four side picture frame and in cable tube connected to it.
Further improvement of these options：Flat-panel speaker is arranged in the four side frame back surfaces.
The advantages and positive effects of the present invention are：
1, the present invention has the front and back projection screen being arranged and decoration painting canvas, and projection screen or/and decoration painting in four side picture frames
Cloth is motor and the roller shutter type that driving mechanism drives.When connecting, projecting apparatus power supply interface is connect with projecting apparatus and projecting apparatus is switched on
When work, it can automatically control and roll decoration painting canvas and expose subsequent projection screen or put down projection screen；When projecting apparatus stops
When only working, decoration painting canvas is put down automatically or rolls projection screen, realize projecting apparatus switching on and shutting down and projection screen exposing or hidden
As long as the coordinated signals of Tibetan simplify operation, improve efficiency using a remote controler.And control system is simple, cost
It is low, easily realize.
2, cable tube is arranged on the top margin of four side picture frames or/and bottom edge in the present invention, and projecting apparatus branch is arranged on cable tube
Projecting apparatus box body is arranged in frame on projector mount, and projecting apparatus is arranged on the projecting apparatus box body, also in shadow instrument box body or
Shot-light is set on projector mount；When opening projecting apparatus by controller, shot-light closing is automatically controlled, is closed when by controller
When closing projecting apparatus and decoration painting canvas exposing, shot-light is automatically opened, operation is further simplified, also ensures the displaying of decoration painting canvas
Effect.
3, the present invention cable in projecting apparatus and control system can be penetrated in the top margin or/and bottom edge of four side picture frames and with
In its cable tube connected, controller is arranged in projecting apparatus box body, neat appearance.Cable tube is alternatively arranged as handle, convenient for removing
Fortune.
4, flat-panel speaker can be arranged in four side frame back surfaces in the present invention, increase acoustic function, and good concealment.
Description of the drawings
Fig. 1 is the dimensional structure diagram that a kind of projection screen of the present invention automatically controls all-in-one machine；
Fig. 2 is the partial schematic sectional view that a kind of projection screen of the present invention automatically controls all-in-one machine；
Fig. 3 is the upward view that a kind of projection screen of the present invention automatically controls all-in-one machine；
Fig. 4 is the back side partial cutaway view that a kind of projection screen of the present invention automatically controls all-in-one machine；
Fig. 5 is the circuit diagram that a kind of projection screen of the present invention automatically controls all-in-one machine.
Serial number in figure：Cable tube under 1-, 2- frames, 3- decorations painting canvas, 4- projecting apparatus box body, 5- projector mounts,
The upper cable tubes of 6-, 7- motors, 8- painting canvas spool, 9- curtains frame, 10- projection screens, 11- shot-lights, 12- projecting apparatus, 13- electricity
Machine fixed frame, 14- connection projecting apparatus power supply interfaces.
Specific implementation mode
Below in conjunction with attached drawing, present invention is further described in detail：
Referring to Fig. 1-Fig. 5, a kind of projection screen of the present invention automatically controls the embodiment of all-in-one machine, including：Projection screen 10, decoration
Painting canvas 3, frame 2 and control system.The frame 2 is four side picture frames, and the projection screen of front and back setting is included in four side picture frames 2
10 and decoration painting canvas 3, the projection screen 10 or/and decoration painting canvas 3 are the roller shutter type that motor 7 and driving mechanism drive.It is above-mentioned
Control system includes connection projecting apparatus power supply interface 14 and controller, and the controller includes curtain switching circuit, above-mentioned electricity
The control terminal of machine 7 is connect with the control output end of curtain switching circuit.When connection projecting apparatus power supply interface 14 and projecting apparatus connect
It connects and when projecting apparatus booting work, the control system, which automatically controls, to be rolled decoration and painting canvas 3 and expose subsequent projection screen 10
Or put down projection screen 10；When projecting apparatus is shut down, the control system, which automatically controls, to be put down decoration painting canvas 3 or rolls projection screen
Cloth 10.
Further, upper cable tube 6, cable under being arranged on the bottom edge of four side picture frames 2 are set in the top margin of four side picture frames 2
Projector mount 5 is arranged in pipe 1 on upper cable tube 6（It can also select that projector mount 5 is arranged on lower cable tube 1）, throwing
Projecting apparatus box body 4 is set on shadow instrument holder 5, projecting apparatus 12 is arranged on projecting apparatus box body 4.For good heat radiating, can throw
Heat emission hole is set on 4 side wall of shadow instrument box body.
Still further, shot-light 11 is arranged on projecting apparatus box body 4 or projector mount 5, above controller further includes penetrating
Shot-light 11 is connect by light switch circuit with the control output end of above-mentioned shot-light switching circuit.In this way, when opening projecting apparatus 12,
When control system automatically controls the closing of shot-light 11, when projecting apparatus 12 is shut down, institute and the decoration stretching, extension exposing of painting canvas 3, control system
Shot-light 11 is automatically opened, good light is provided to decoration painting canvas 3, convenient for preferably showing picture.
In the embodiment shown in Figure 2：Projection screen 10 is fixed, and 10 surrounding of projection screen passes through with four side picture frames 2
Curtain frame 9 is fixedly connected, and tension spring can also be used to connect, so that projection screen 10 is tightened smooth.Decorate painting canvas 3 be roller shutter type and
Be arranged before projection screen 10, above-mentioned motor 7 be tube shaped electric machine, above-mentioned driving mechanism include connect with tube shaped electric machine 7 and
The painting canvas spool 8 being horizontally installed in the top margin of four side picture frame 2, by decoration painting canvas 3 on painting canvas spool 8, four sides
The upper edge of picture frame 2 is fixed, and counterweight is arranged in the lower edge of four side picture frames 2, can increase its drapability, decorates the both sides of painting canvas 3
It stretches into the guide groove being arranged in four side picture frames, 2 both sides, prevents decoration painting canvas 3 from shaking.Above described tubular motor 7 is fixed by motor
Frame 13 is fixed on one end in the top margin of four side picture frames 2.Advertisement painting canva, canvas, chemical fibre or plastics may be used in decoration painting canvas 3
The suitable painting canvas such as cloth, can be with the decorative paintings such as landscape or personage face etc. in air brushing, printing or Freehandhand-drawing.
Above controller is arranged in projecting apparatus box body 4, and projecting apparatus box body 4 is placed on alternatively, it is also possible to TV box etc.
It is interior.Cable in projecting apparatus 12 and control system penetrates in the top margin or/and bottom edge of four side picture frames 2 and upper cable connected to it
In pipe 6 or/and lower cable tube 1.
To increase acoustic function, and good concealment, also flat-panel speaker is arranged at the back side of four side picture frames 2 in the present invention.
Referring to Fig. 5, specifically：Above-mentioned curtain switching circuit includes intermediate relay J1, the confession of intermediate relay J1
Electric coil end J1A and power supply coil end J1B is connected with the connection projecting apparatus with power supply interface, the stationary contact of intermediate relay J1
Point end J1C is connect with a power supply end L of the motor.The normally closed movable contact J1E of the intermediate relay J1 with it is described
The decline control terminal DOWN connections of motor 7, the rising control of the normally opened movable contact J1D and the motor 7 of the intermediate relay J1
UP connections in end processed.
When connect projecting apparatus connect with projecting apparatus 12 with power supply interface 14 and projecting apparatus 12 booting work when, the centre after
Electric appliance J1 energized actions, stationary contact end J1C are connected to normally opened movable contact J1D, and the rising control terminal UP of the motor 7, which is connected, to be supplied
Electric power end L, motor 7 rise operation, and decoration painting canvas 3 is driven to roll.
When projecting apparatus 12 is not powered on work, the intermediate relay J1 does not work, the decline control terminal DOWN of motor 7
Power supply end L is connected by the normally closed movable contact J1E and stationary contact end J1C of relay J1, motor 7 declines operation, drives dress
Painting canvas 3 is adornd to decline.
Further, above-mentioned shot-light switching circuit includes intermediate relay J2, the power supply coil end J2A of intermediate relay J2
It is connected with power supply interface with the connection projecting apparatus with power supply coil end J2B, the stationary contact end J2C of the intermediate relay J2
It is connect with a power supply end L of the shot-light, the normally closed movable contact J2E of the intermediate relay J2 and the one of the shot-light
End connection, the other end of the shot-light are connected to another power supply end N.In this way, when projecting apparatus 12 is not powered on work, penetrate
Lamp 11 is powered on；When connect projecting apparatus connect with projecting apparatus 12 with power supply interface 14 and projecting apparatus 12 booting work when, it is described
Intermediate relay J2 energized actions, stationary contact end J2C and normally closed movable contact J2E are disconnected, and 11 dead electricity of shot-light is closed.
For convenience of control shot-light 11, a manual switch K is also in series in the current supply circuit of shot-light 11, in this way, ought not make
Shot-light 11 is closed with K can also be operated with manual switches when projecting apparatus 12.
In the embodiment shown in fig. 5, above-mentioned connection projecting apparatus power supply interface 14 is USB male joint interface, straight using 5 volts
Galvanic electricity source, correspondingly, intermediate relay J1 and intermediate relay J2 also use 5 volts of DC relays.Connect projecting apparatus power supply
Interface 14 is only to provide power supply, need not connect data.The rated voltage 220V of motor 7, uplink, downlink bidirectional movement carry
Mechanical trip limits.The power supply of motor 7 is alternating current, by the intermediate relay J1 in controller control the uplink of motor 7 with
Downlink.Four pins are motor downlink, motor uplink, zero curve, ground wire respectively.When 7 uplink of motor, pass through the included machine of motor 7
Tool travel limiting function（10 size of uplink stroke-limit combination projection screen is adjusted in place in advance）, all exposings of projection screen 10
Afterwards, limit switch triggers, and cut-out 7 uplink of motor power supply, motor 7 shuts down.7 downlink of motor similarly, repeats no more.
Certainly, above description is not limitation of the present invention, and the present invention is also not limited to the example above, the art
Those of ordinary skill the present invention essential scope in, the variations, modifications, additions or substitutions made should also belong to this hair
Bright protection domain.
Claims (10)
1. a kind of projection screen automatically controls all-in-one machine, including：Projection screen, decoration painting canvas, frame and control system, feature
It is, the frame is four side picture frames, includes the projection screen and decoration painting canvas of front and back setting, the throwing in the picture frame of four side
Shadow curtain or/and decoration painting canvas are motor and the roller shutter type that driving mechanism drives, and the control system includes that connection projecting apparatus is used
Power supply interface and controller, the controller include curtain switching circuit, control terminal and the curtain switching circuit of the motor
Control output end connects；When connect projecting apparatus power supply interface connect with projecting apparatus and projecting apparatus booting work when, the control
System, which automatically controls, to be rolled decoration painting canvas and exposes subsequent projection screen or put down projection screen；When projecting apparatus is shut down, institute
It states control system and automatically controls and put down decoration painting canvas or roll projection screen.
2. projection screen described in accordance with the claim 1 automatically controls all-in-one machine, which is characterized in that be arranged on the picture frame of four side
Shot-light, the controller further include shot-light switching circuit, and the shot-light is connect with the control output end of the shot-light switching circuit,
Connect with projecting apparatus and when projecting apparatus booting work when connecting projecting apparatus power supply interface, described in the control system automatically controls
Shot-light is closed, and when projecting apparatus is shut down and the decoration painting canvas exposes, the control system automatically opens the shot-light.
3. projection screen automatically controls all-in-one machine according to claim 2, which is characterized in that the top margin of four side picture frame
Or/and cable tube is set on bottom edge, projector mount is set on the cable tube of the top margin of four side picture frame or bottom edge connection, institute
Setting projecting apparatus box body on projector mount is stated, the projecting apparatus is arranged in the projecting apparatus box body, and the shot-light setting exists
The projecting apparatus box body.
4. automatically controlling all-in-one machine according to claim 1-3 any one of them projection screens, which is characterized in that the projection screen
Cloth is fixed, and the projection screen surrounding is fixedly connected with four side picture frame by curtain frame, and the decoration painting canvas is
Roller shutter type and it is arranged before the projection screen, the motor is tube shaped electric machine, and the driving mechanism includes and the tubulose
The painting canvas spool that motor is connected and is horizontally installed in the top margin of four side picture frame, the decoration painting cloth is wound on the painting canvas
On spool, the tube shaped electric machine is fixed on one end in the top margin of four side picture frame by motor fixing frame.
5. projection screen described in accordance with the claim 3 automatically controls all-in-one machine, which is characterized in that the curtain switching circuit
Including intermediate relay J1, the power supply coil end J1A and power supply coil end J1B of intermediate relay J1 with the connection projecting apparatus
It is connected with power supply interface, the stationary contact end J1C of intermediate relay J1 is connect with a power supply end L of the motor；It is described
The normally closed movable contact J1E of intermediate relay J1 is connect with the decline control terminal DOWN of the motor, the intermediate relay J1's
Normally opened movable contact J1D is connect with the rising control terminal UP of the motor.
6. projection screen described in accordance with the claim 3 automatically controls all-in-one machine, which is characterized in that the shot-light switching circuit
Including intermediate relay J2, the power supply coil end J2A and power supply coil end J2B of intermediate relay J2 with the connection projecting apparatus
It being connected with power supply interface, the stationary contact end J2C of the intermediate relay J2 is connect with a power supply end L of the shot-light,
The normally closed movable contact J2E of the intermediate relay J2 is connect with one end of the shot-light, and the other end of the shot-light is connected to separately
One power supply end N.
7. automatically controlling all-in-one machine according to the projection screen described in claim 3 or 6, which is characterized in that in the shot-light
A manual switch K is also in series in current supply circuit.
8. automatically controlling all-in-one machine according to projection screen according to claim 2 or 3, which is characterized in that the controller setting
In the projecting apparatus box body, the cable in the projecting apparatus and control system penetrates top margin or/and the bottom of four side picture frame
In side and in cable tube connected to it.
9. automatically controlling all-in-one machine according to claim 1-3 any one of them projection screens, which is characterized in that four sides
Flat-panel speaker is arranged in frame back surface.
10. projection screen automatically controls all-in-one machine according to claim 8, which is characterized in that the four side picture frame back ofs the body
Flat-panel speaker is arranged in face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810381390.XA CN108398851A (en) | 2018-04-25 | 2018-04-25 | A kind of projection screen automatically controls all-in-one machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810381390.XA CN108398851A (en) | 2018-04-25 | 2018-04-25 | A kind of projection screen automatically controls all-in-one machine |
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| Publication Number | Publication Date |
|---|---|
| CN108398851A true CN108398851A (en) | 2018-08-14 |
Family
ID=63100574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810381390.XA Pending CN108398851A (en) | 2018-04-25 | 2018-04-25 | A kind of projection screen automatically controls all-in-one machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109991804A (en) * | 2019-05-18 | 2019-07-09 | 烟台工程职业技术学院(烟台市技师学院) | A kind of lift Projection Display all-in-one machine |
| CN111554131A (en) * | 2020-05-07 | 2020-08-18 | 杨刚华 | Demonstration courseware for enhancing understanding ability of students to language abstract concepts |
| CN113075852A (en) * | 2021-04-08 | 2021-07-06 | 青岛科技大学 | Mural type short-focus projection screen and control method |
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| CN203882084U (en) * | 2014-04-01 | 2014-10-15 | 天津市宝晶投影器材有限公司 | Power-driven display picture pull-lift projection screen |
| CN204288750U (en) * | 2014-12-16 | 2015-04-22 | 吴建伟 | A kind of outdoor projection formula billboard |
| CN208255616U (en) * | 2018-04-25 | 2018-12-18 | 青岛同鑫创新实验室科技有限公司 | A kind of projection screen automatic control all-in-one machine |
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| CN101162354A (en) * | 2006-10-13 | 2008-04-16 | 株式会社日立制作所 | Projection image display system |
| CN201110937Y (en) * | 2007-07-27 | 2008-09-03 | 程治国 | Canvas frame type automatic projection curtain |
| CN203882084U (en) * | 2014-04-01 | 2014-10-15 | 天津市宝晶投影器材有限公司 | Power-driven display picture pull-lift projection screen |
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| CN109991804A (en) * | 2019-05-18 | 2019-07-09 | 烟台工程职业技术学院(烟台市技师学院) | A kind of lift Projection Display all-in-one machine |
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| CN113075852A (en) * | 2021-04-08 | 2021-07-06 | 青岛科技大学 | Mural type short-focus projection screen and control method |
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| PB01 | Publication | ||
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Application publication date: 20180814 |